WO2015115463A1

WO2015115463A1 - Method for manufacturing disposable wearable article

Info

Publication number: WO2015115463A1
Application number: PCT/JP2015/052316
Authority: WO
Inventors: 梅林　豊志
Original assignee: 株式会社瑞光
Priority date: 2014-02-03
Filing date: 2015-01-28
Publication date: 2015-08-06
Also published as: CN106413646B; CN106413646A; MY182657A; JPWO2015115463A1; JP6410402B2

Abstract

A method for manufacturing a disposable wearable article, comprising processing an intermediate product while conveying the intermediate product in a state in which a back part and a front part of a disposable wearable article (1) provided with a front part (20) for covering the front torso of a wearer, a back part (21) for covering the rear torso of the wearer, and a crotch part (22) for covering the groin of the wearer are separated via the crotch part in a conveyance direction (Y), the method being provided with a step for conveying a nonwoven fabric web (W1) having a set longitudinal direction, a step for successively cutting a continuous web (W2) forming a liquid-impermeable back sheet (27) to a predetermined length so that a distal-end line (27F) on the downstream side (Y1) of the back sheet is convex toward the downstream side, and a step for intermittently arranging the back sheet (27) in the conveyance direction (Y) of the nonwoven fabric web (W1) so that the convex distal-end line (27F) is on the downstream side in the conveyance direction (Y).

Description

Method for producing disposable wearing article

The present invention relates to a method for manufacturing disposable wearing articles.

In a so-called longitudinal flow manufacturing method, a liquid-impermeable back sheet may be intermittently disposed on the skin surface side of a continuous nonwoven fabric web (Patent Document 1).

JP2011-62461A (front page)

In the case of such a manufacturing method, when the adhesive is applied over the entire width up to both side edges of the backsheet, the adhesive protrudes from the backsheet, and the adhesive adheres to other components and manufacturing equipment of the diaper. End up. Therefore, it is necessary to provide a region where no adhesive is applied to the side edge in the width direction of the backsheet.

However, when there is a region where the adhesive is not applied to both side edges as described above, the back sheet is laminated when the back sheet is laminated on the nonwoven fabric web, or when another sheet or web is laminated on the back sheet. This causes a problem that the front end corner of the sheet is turned up by the wind pressure due to the conveyance and wrinkles are generated.

An object of the present invention is to provide a method for producing a disposable worn article that is less likely to be wrinkled by back sheet curling.

The method of the present invention includes a front part covering a wearer's front torso, a back part covering a wearer's rear torso, and a front part and a back part of a disposable wearing article including a crotch part covering a crotch of the wearer. Is a method for manufacturing a disposable wearing article that is processed while transporting an intermediate product in a state of being separated via the crotch portion in the transport direction,
A step of conveying a nonwoven web whose longitudinal direction is set in the conveying direction;
Cutting the continuous web to be a plurality of liquid-impermeable back sheets one after another into a predetermined length so that the downstream end line of each back sheet is convex toward the downstream side;
Disposing the back sheet intermittently in the transport direction of the nonwoven web so that the convex tip line is downstream in the transport direction.

According to the present invention, the downstream end in the conveyance direction of the back sheet is formed by a leading end line that is convex toward the downstream side. Therefore, even when the adhesive is not applied to both side edges in the width direction perpendicular to the conveyance direction of the back sheet bonded to the nonwoven fabric web, both corners on the front end side of the back sheet are difficult to turn.

FIG. 1A is a developed plan view showing an example of a wearing article created by the manufacturing method of the present invention, and FIG. 1B is a cross-sectional view thereof. 2A and 2B are process diagrams showing a method for manufacturing the wearing article. 3A to 3C are plan views showing other examples of the shape of the backsheet.

Preferably, in the step of cutting, the backsheet is generated such that an upstream rear end line of the backsheet becomes concave toward the upstream side.

In this case, a piece generated in the back sheet is small or no piece is formed, so that it is difficult to waste material.

More preferably, in the step of cutting, one cutting line for cutting the continuous web includes the rear end line of the preceding back sheet and the subsequent back sheet of the back sheets adjacent to each other in the transport direction. And both of the tip lines.

In this case, no cut ends are generated in the backsheet, so that no material is wasted and an apparatus and a process for processing the cut ends are unnecessary.

Preferably, in the cutting step, the continuous web is cut so that the tip line is formed in an arc shape over the entire width in the width direction orthogonal to the conveyance direction of the backsheet.

In this case, both corners of the arcuate tip line will be difficult to turn.
Also, since the cutting edge of the die cutter does not contact the anvil roll over the entire width at once, the sharpness will be improved even with a thin backsheet, and the operating rate of the apparatus will be improved.

Preferably, in the step of cutting, the continuous web is cut such that corners at both ends in the width direction orthogonal to the conveyance direction of the backsheet are chamfered.
The corners of the chamfered shape will be difficult to turn.
The “chamfered shape” means a shape in which a corner on the front end side of the back sheet is cut off, and may be a round (small arc) or a linear taper.

The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and figures are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined only by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.
In addition, in part of the katakana notation in this specification, English words are also written in parentheses in order to make the meaning clearer.

Hereinafter, prior to the description of the manufacturing method according to Example 1 of the present invention, an example of the structure of the wearing article 1 will be described with reference to the drawings.

As shown in FIGS. 1A and 1B, the wearing article 1 of Example 1 includes an absorbent main body 2 and an exterior nonwoven fabric 3. The absorbent main body 2 has a front part 20, a back part 21 and a crotch part 22. The front part 20 covers the wearer's front trunk (front part of the trunk) and extends in the trunk circumference direction X. The back portion 21 covers the wearer's rear trunk (the rear part of the trunk) and extends in the trunk circumference direction X. The crotch part 22 covers the crotch of the wearer between the front part 20 and the back part 21.

The crotch portion 22 is connected to the front portion 20 and the back portion 21, and the absorbent main body 2 is long in the longitudinal direction (longitudinal direction) Y orthogonal to the waistline direction X.

1A, the wearable article is worn in a state where the crotch portion 22 is folded in two along a virtual line parallel to the waistline direction X. As a result, the ends of the front waistline portion 3F and the rear waistline portion 3B in the waistline direction X overlap each other.

As shown in FIG. 1B, the absorbent main body 2 is provided with an absorbent core 24. The absorption core 24 absorbs body fluid. The absorbent core 24 is sandwiched between a top sheet 26 and a back sheet 27. The

sheets

26 and 27 and the absorbent core 24 are stacked on each other.
The width of the backsheet 27 in the waistline direction X may be larger than the width of the topsheet 26 in the waistline direction X. As shown in FIG. 1A, the top sheet 26 extends from the side edge in the longitudinal direction Y of the front waistline portion 3F to the side edge in the longitudinal direction Y of the rear waistline portion 3B.

In FIG. 1B, the top sheet 26 is made of a liquid-permeable thin nonwoven fabric and covers the skin surface of the absorbent core 24. A cuff 25 may be provided on the top sheet 26.
In the present invention, the “skin surface” means an inner surface that directly or indirectly contacts the wearer's skin when the diaper is worn, and directly or indirectly faces the wearer's skin.

The back sheet 27 covers the non-skin surface of the absorbent core 24 and is made of a liquid-impermeable resin sheet. The non-skin surface of the back sheet 27 is laminated by adhering an exterior nonwoven fabric 3 having air permeability.
As shown in FIG. 1A, one end line 27F in the longitudinal direction Y of the backsheet 27 is defined by a convex curve, and the other end line 27B is defined by a concave curve. That is, one end line 27F of the backsheet 27 protrudes at the center in the waistline direction X, and the other end line 27B is recessed at the center in the waistline direction X. In other words, the one end line 27F is convex toward the side edge in the longitudinal direction Y of the front waistline portion 3F, while the other end line 27B is the longitudinal length of the rear waistline portion 3B. It has a concave shape with respect to the side edge in the direction Y.
In the present invention, the “non-skin surface” means an outer surface that does not contact the wearer's skin when the diaper on the side opposite to the skin surface is worn, and does not face the wearer's skin.

1A, the absorbent main body 2 is disposed between the front waistline portion 3F and the rear waistline portion 3B. The back sheet 27 is not provided in part of the front waistline portion 3F and the rear waistline portion 3B. That is, the back sheet 27 is shorter in the longitudinal direction Y than the exterior nonwoven fabric 3, thereby ensuring air permeability in the front and rear body portions.

The front and

rear waistline portions

3F and 3B form a pair of front flaps F and rear flaps F that protrude from the absorbent main body 2 in the waistline direction X, and each of the flaps F is a front and rear waistline portion. Part of it. That is, as shown to FIG. 1A, each said flap F protrudes in the trunk periphery direction X rather than the crotch part 22, and has extended in the trunk periphery direction X rather than the absorptive main body 2 (crotch part 22).

Elastic members for waist or hip may be provided on the front and

rear waist portions

3F and 3B.
The elastic member is for fitting the

waist portions

3F and 3B to the wearer. As this elastic member, for example, a thread-like or belt-like material containing a plurality of thread rubbers, flat rubbers, thermoplastic resins (hot melt), or urethane foam can be employed.

The absorbent main body 2 may be formed with a leg portion that is constricted along the leg of the wearer. Another elastic member made of, for example, rubber thread may be provided along the leg circumference and the leg circumference of the

waist circumference parts

3F and 3B so as to follow the wearer's leg circumference. .

When the wearing article is a diaper, a tape material 4 to which a fixing agent is applied may be fixed to the waistline portion 3B. In this case, the surface on which the fixing agent easily adheres is provided. It is necessary to form on the non-skin surface of the front waistline portion 3F.
Instead of the tape material 4, a male fastener (not shown) is fixed to the rear waistline portion 3B as a fastening member, while a female surface fastener is attached to the non-skin surface of the front waistline portion 3F. It may be fixed.
Moreover, when a wearing article is a pants (pants) type | mold, the edge parts of the trunk periphery direction X of the front flap F and the rear flap F may be welded.

Next, a method for manufacturing the worn article will be described with reference to FIG.

As shown in FIG. 2A, the nonwoven fabric web W <b> 1 having the longitudinal direction Y set in the transport direction Y is transported, and the continuous web W <b> 2 that becomes the liquid-impermeable back sheet 27 is transported.
The continuous web W2 is introduced between a cutter roll provided with a die cutter (not shown) and an anvil roll, and a predetermined end line 27F on the downstream side of the backsheet 27 is convex toward the downstream Y1. Cut to length one after another. By this cutting, individual back sheets 27 are generated from the continuous web W2. At the time of cutting, the blade of the die cutter is in partial and continuous contact with the anvil roll, so that the sharpness of the back sheet 27 is improved.
That is, the continuous web W2 introduced between the cutter roll and the anvil roll is conveyed downstream by the rotation of both rolls, and is continuously continuous along an arc from the downstream end of the front end line 27F. W2 is disconnected.

In the cutting step, the back sheet 27 is generated in a state where the leading end line 27F and the trailing end line 27B coincide. Accordingly, each backsheet 27 is generated such that the upstream rear end line 27B of the backsheet 27 becomes concave toward the upstream Y2.
That is, in the cutting step, the rear end line 27B of the preceding back sheet 27 and the front end line 27F of the subsequent back sheet 27 among the

back sheets

27, 27 adjacent to each other in the transport direction Y are formed simultaneously.

In the case of the present embodiment, in the cutting step, the continuous web W2 is cut so that the tip line 27F is formed in an arc shape over the entire width in the width direction X orthogonal to the conveyance direction Y of the backsheet 27. The After the cutting, the individual back sheets 27 are separated from the continuous web W2 in the transport direction Y.

The back sheet 27 is intermittently arranged in the transport direction Y of the nonwoven web W1 so that the convex tip line 27F is on the downstream side Y1 in the transport direction Y. That is, the back sheet 27 is arranged so that the side edge of the back sheet 27 in the transport direction Y and the side edge of the nonwoven fabric web W1 in the transport direction Y are parallel to each other.
Prior to this arrangement, an adhesive is applied to the bonding area C indicated by the halftone dots on the back sheet 27, the continuous web W2 or the non-woven web W1.
Therefore, the back sheet 27 is joined to the nonwoven fabric web W1 by the above arrangement, and a laminated intermediate product is generated.

Here, the width Wc of the adhesion region C is smaller than the width W27 of the back sheet 27, and no adhesive is applied to the side edges 27E along the downstream side Y1, and the side edges 27E are fixed to the nonwoven fabric web W1. It has not been.
However, the front end line 27F on the downstream side Y1 of the back sheet 27 is formed to be convex. Therefore, it is possible to suppress the side edges 27E from being turned up by the wind pressure due to conveyance.

After the backsheet 27 is disposed, the absorbent core 24 may be disposed on each backsheet 27 and the absorbent core 24 may be joined to the backsheet 27.

Thereafter, the pair of tape members 4 of FIG. 2B are joined to the nonwoven web W1, and a liquid-permeable continuous web W3 to be the top sheet 26 is laminated so as to cover the absorbent core 24 and the backsheet 27.

Thereafter, a pair of continuous webs W4 for cuff to be the cuff 25 is laminated to produce a continuous laminate (intermediate product) L. The continuous web W3 is exposed between the width direction X of the pair of cuff continuous webs W4. After the lamination, a part of the nonwoven fabric web W1 may be cut out to form a leg hole.

Then, in order to obtain each wearing article 1 from the continuous laminate L, the continuous laminate L is cut along a virtual line extending in the width direction X orthogonal to the transport direction Y. In addition, the said continuous laminated body L is cut | disconnected between the mutually adjacent absorptive

main bodies

2 and 2. As shown in FIG. In this way, the wearing article 1 of FIG. 1A is obtained.

Next, another example of the back sheet 27 will be described.
As shown in FIGS. 3A to 3C, in the cutting step, the continuous web W2 (FIG. 2A) is formed such that corners 27C at both ends in the width direction X orthogonal to the conveyance direction Y of the backsheet 27 are chamfered. ) May be cut.

In the chamfered shape, the corners 27C at both ends in the width direction X of the straight tip line 27F may be cut obliquely in a straight line as shown in FIG. 3A, or in a small round shape as shown in FIG. 3B. It may be cut round.
Further, as shown in FIG. 3C, the corner portions 27C at both ends in the width direction X of the chamfered tip line 27F may be cut into a small round shape.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, it is not necessary to match the shapes of the front end line 27F and the rear end line 27B, and the rear end line 27B may be defined by a straight line extending in the width direction X, or may be defined by a convex curve toward the upstream. Good.
Moreover, the web used as a top sheet may be laminated | stacked intermittently.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.

The present invention can be applied to a diaper-type and pants-type disposable wearing article manufacturing method.

1: worn article
2: Absorbent body 20: Front part 21: Back part 22: Crotch part
24: Absorbent core 25: Cuff 26: Top sheet 27: Back sheet 27C: Corner part 27E: Side edge 27F: Front end line 27B: Rear end line 3:

Exterior nonwoven fabric

3F, 3B: Girth part 4: Tape material (fastening) Element)
C: Adhesive F: Flap L: Continuous laminated body X: Trunk circumference direction (width direction) Y: Longitudinal direction (conveyance direction) Y1: Downstream side Y2: Upstream side W1: Non-woven fabric web W2: Continuous web
W3: Permeable continuous web W4: Continuous web for cuff

Claims

The front part and the back part of the disposable wearing article provided with a front part covering the wearer's front torso, a back part covering the wearer's rear torso, and a crotch part covering the crotch of the wearer A method for manufacturing a disposable wearing article that is processed while conveying an intermediate product in a state of being separated via a crotch part,
A step of conveying a nonwoven web whose longitudinal direction is set in the conveying direction;
Cutting the continuous web to be a plurality of liquid-impermeable back sheets one after another into a predetermined length so that the downstream end line of each back sheet is convex toward the downstream side;
Disposing the back sheet intermittently in the transport direction of the nonwoven web so that the convex tip line is downstream in the transport direction.
The manufacturing method according to claim 1, wherein in the cutting step, the backsheet is generated such that an upstream rear end line of each backsheet becomes concave toward the upstream side.
In the cutting step, one cutting line for cutting the continuous web includes the rear end line of the preceding back sheet and the front end line of the subsequent back sheet among the back sheets adjacent to each other in the transport direction. The manufacturing method of Claim 2 which forms both.
The said continuous web is cut | disconnected in the said cutting process so that the said front end line may be formed in circular arc shape over the full width of the width direction orthogonal to the conveyance direction of each said backsheet. Manufacturing method.
The manufacturing method according to claim 1, 2 or 3, wherein, in the cutting step, the continuous web is cut such that corners at both ends in the width direction perpendicular to the conveying direction of the back sheets are chamfered.